US20120090283A1 - Apparatus for welding and separating packaging materials - Google Patents

Apparatus for welding and separating packaging materials Download PDF

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Publication number
US20120090283A1
US20120090283A1 US13/262,810 US201013262810A US2012090283A1 US 20120090283 A1 US20120090283 A1 US 20120090283A1 US 201013262810 A US201013262810 A US 201013262810A US 2012090283 A1 US2012090283 A1 US 2012090283A1
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US
United States
Prior art keywords
cutting
tensioning device
anvil
sonotrode
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/262,810
Inventor
Juergen Ippers
Ulrich Wieduwilt
Claudia Broos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BROOS, CLAUDIA, IPPERS, JUERGEN, WIEDUWILT, ULRICH
Publication of US20120090283A1 publication Critical patent/US20120090283A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/62—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
    • B26D1/626—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B29C66/83513—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums cooperating jaws mounted on rollers, cylinders or drums and moving in a closed path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/306—Counter-rotating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/207—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web advancing continuously

Definitions

  • Bag forming, filling and sealing machines that package, for example, sweets or other articles are known in the prior art.
  • an oblong closed sleeve is normally produced from a film over a moulding shoulder and then the open end of the sleeve is sealed by way of a cross sealing operation.
  • the sleeve is then filled and sealed again above the filling region by means of a further cross sealing process.
  • a first side of a following bag (head end) is also sealed.
  • a cutting apparatus is usually provided then in order to separate the bags that are still joined together.
  • it is known to carry out the welding operation for example, by means of ultrasound, the ultrasonic welding apparatus including a sonotrode and an anvil.
  • the packaging material is welded between the sonotrode and the anvil by the two parts making contact.
  • the sonotrode preferably includes a plurality of radially outwardly projecting sonotrode segments and the anvil includes a plurality of radially outwardly projecting anvil segments. Consequently, the sonotrode and the anvil are each realized in a star-shaped manner and a rotational sealing system can be provided which ensures a high sealing output per unit time.
  • the recess in this case, is preferably rectangular or triangular or trapezoidal or circular.
  • the adjusting device includes two slanting planes, which are arranged in line with each other, and by means of a relative displacement on the two planes, the corresponding change in height can be made.
  • the invention relates to a bag forming, filling and sealing machine, which comprises an apparatus according to the invention for welding and separating packaging materials.
  • the sonotrode and the anvil are arranged vertically and the conveying direction of the created tubular bags is also vertical. This means that it is also possible for the packaging material to be entrained through contact between the sonotrode and the anvil during the sealing steps.
  • the number of sonotrode segments and the number of anvil segments is freely selectable and, where applicable, is dependent on the product size or on a diameter of the rotating sonotrode or of the rotating anvil.
  • an even number of sonotrode segments and anvil segments is preferred and 2 to 8 segments are particularly preferred, preferably in each case 6 segments.
  • FIG. 1 shows a schematic view of an apparatus according to a first exemplary embodiment of the invention, in a first position
  • FIG. 2 shows a schematic view of the apparatus in FIG. 1 , in a second position
  • FIG. 3 shows a schematic view of the apparatus in FIG. 1 , in a third position
  • FIG. 4 shows a schematic view of the apparatus in FIG. 1 , in a fourth position
  • FIG. 5 shows a schematic view of the apparatus in FIG. 1 , in a fifth position
  • FIG. 6 shows a schematic side view of a cutting and tensioning device according to the first exemplary embodiment
  • FIG. 7 shows a schematic view of the apparatus according to a second exemplary embodiment
  • FIG. 8 shows a schematic view of the apparatus according to a third exemplary embodiment of the invention.
  • FIGS. 1 to 6 An apparatus 1 for welding and separating packaging materials according to a preferred exemplary embodiment of the invention is described below in detail with reference to FIGS. 1 to 6 .
  • the sonotrode and the anvil 4 are arranged vertically and the packaging material 8 is guided through between the sonotrode 3 and the anvil 4 in the direction of arrow A.
  • the apparatus 1 includes a combined cutting and tensioning device 5 .
  • the combined cutting and tensioning device 5 is used, on the one hand, for tensioning the packaging material 8 and, on the other hand, for cutting the packaging material in order to separate the leading bag 9 from the trailing bag 10 .
  • the cutting and tensioning device 5 is arranged on the anvil 4 , more precisely on each anvil segment 4 a .
  • the cutting and tensioning device 5 in this case, is arranged on the anvil between the first sealing region 14 and the second sealing region 24 of the anvil segment. In this case, the cutting and tensioning device 5 protrudes at a height H radially above the anvil segment 4 a .
  • the cutting and tensioning device 5 includes a height adjusting device 7 in order to adjust a relative position of the cutting and tensioning device 5 in relation to the anvil segment 4 a .
  • the height adjusting device 7 includes a first slanting plane 7 a and a second slanting plane 7 b .
  • the height adjusting device 7 includes a first screw 71 and a second screw 72 . Said two screws 71 , 72 , as indicated by the two double arrows R and S, can be adjusted in both directions in the longitudinal direction of the cutting edge 6 .
  • a recess 11 is provided in the sonotrode segment 3 a .
  • the recess 11 is arranged at a similar position on the sonotrode segment 3 a as the cutting and tensioning device 5 on the anvil, i.e. between the first sealing region 13 and the second sealing region 23 .
  • the recess 11 in this case, is developed in such a manner that contact between the cutting and tensioning device 5 and the sonotrode 3 during the operation is avoided.
  • the recess 11 is rectangular. However, it can be circular, as shown in FIG. 6 , or trapezoidal, as shown in FIG. 7 .
  • the recess 11 forms with, in each case, an outer circumferential region of the sonotrode segment 3 a an edge 12 that supports a tensioning operation of the packaging material 8 .
  • the cutting edge 6 comes into contact with the packaging material 8 between the leading bag 9 and the trailing bag 10 .
  • this is not yet a cutting operation as the packaging material 8 is not yet correctly tensioned.
  • the sonotrode 3 and the anvil 4 rotate further in the direction of arrows B and C
  • the cutting edge 6 of the cutting and tensioning device 5 migrates somewhat into the recess 11 .
  • the packaging material is tensioned at a region 8 a substantially between the cutting edge 6 and the edge 12 on the sonotrode segment 3 a .
  • the sealing operation for the head end of the trailing bag 10 begins by means of the first sealing regions 13 , 14 .
  • the leading bag 9 has been conveyed further by a conveying device (not shown) and the sealing operation of the head seam at the trailing bag 10 has just been completed.
  • a conveying function for the trailing bag 10 is also carried out. Said bag is subsequently filled and conveyed further until the following sonotrode or anvil segments then carry out the foot seam and the tensioning and cutting operation by means of the tensioning and cutting device 5 .
  • both the sealing of a head seam and a foot seam and separating of two consecutive bags can be carried out in one operating cycle.
  • the cutting operation in this case, requires no additional auxiliary power with, for example, pneumatic or hydraulic support and runs completely free of wear.

Abstract

The invention relates to an apparatus for welding and separating a packaging material (8), comprising an ultrasonic welding apparatus (2) having a sonotrode (3) with at least one sonotrode segment (3 a), and an anvil (4) with at least one anvil segment (4 a), and a combined cutting and tensioning device (5), wherein the sonotrode (3) can be rotated about a first rotational axis, and wherein the anvil (4) can be rotated about a second rotational axis. The cutting and tensioning device (5) is integrated in the ultrasonic welding apparatus (2), wherein initially, the cutting and tensioning device (5) tensions the fed packaging material (8), cutting it thereafter in a tensioned state with a blade (6).

Description

    BACKGROUND OF THE INVENTION
  • The present invention relates to an apparatus for welding and separating packaging materials with a combined cutting and tensioning device, which is used, in particular, in bag forming, filling and sealing machines.
  • Bag forming, filling and sealing machines that package, for example, sweets or other articles are known in the prior art. In this case, an oblong closed sleeve is normally produced from a film over a moulding shoulder and then the open end of the sleeve is sealed by way of a cross sealing operation. The sleeve is then filled and sealed again above the filling region by means of a further cross sealing process. In this case, at the same time as the second cross sealing process is performed at the foot end of a tubular bag, a first side of a following bag (head end) is also sealed. A cutting apparatus is usually provided then in order to separate the bags that are still joined together. In this case, it is known to carry out the welding operation, for example, by means of ultrasound, the ultrasonic welding apparatus including a sonotrode and an anvil. The packaging material is welded between the sonotrode and the anvil by the two parts making contact.
    • SUMMARY OF THE INVENTION
  • The apparatus according to the invention has, in contrast, the advantage that it makes it possible to weld and separate packaging material, in particular tubular bags, in one operating step. Provided according to the invention for this purpose is an ultrasonic welding apparatus having a sonotrode with at least one sonotrode segment, and an anvil with at least one anvil segment. In this case, the sonotrode and the anvil are in each case arranged so as to be rotatable about an axis of rotation. In addition, a combined cutting and tensioning device is provided which initially tensions a supplied packaging material and then cuts it. The combined cutting and tensioning device, in this case, is a one-piece tool that can carry out the two functions of “tensioning and cutting” and is incorporated in the ultrasonic welding apparatus. The cutting and tensioning device includes a cutting edge which preferably carries out a tensioning operation as well as a cutting operation.
  • The cutting and tensioning device is preferably located on the anvil. This means that a particularly compact and simple setup can be achieved.
  • In addition, the sonotrode preferably includes a plurality of radially outwardly projecting sonotrode segments and the anvil includes a plurality of radially outwardly projecting anvil segments. Consequently, the sonotrode and the anvil are each realized in a star-shaped manner and a rotational sealing system can be provided which ensures a high sealing output per unit time.
  • In order to enable as rapid an adaptation as possible to different packaging requirements, the combined cutting and tensioning device also includes an adjusting device in order to adjust the cutting and tensioning device in the radial direction. This means that, in particular, a position of an edge of cut between two consecutive packagings is able to be changed in a simple manner.
  • According to a further preferred development of the invention, a recess is formed on the sonotrode segment, said recess being arranged in such a manner that it accommodates the combined cutting and tensioning device at least partially for the cutting operation without there being any contact, in this case, between the cutting and tensioning device and the walls of the recess or of the sonotrode. This ensures that a packaging material is cut without the cutting tool contacting another component.
  • This means that there can be no wear on the combined cutting and tensioning device. This also means that vibration decoupling, in particular, can be dispensed with such that the apparatus according to the invention is very cost-efficient. The recess, in this case, is preferably rectangular or triangular or trapezoidal or circular.
  • In a particularly preferred manner, the adjusting device includes two slanting planes, which are arranged in line with each other, and by means of a relative displacement on the two planes, the corresponding change in height can be made.
  • In order to be able to carry out different types of cuts, the combined cutting and tensioning device is preferably arranged on the anvil so as to be exchangeable. A cutting edge of the cutting and tensioning device, in this case, is selected in an arbitrary manner and is provided, in particular, straight or undulating or in a zigzag arrangement.
  • In a further preferred manner, a first and a second sealing region is realized in each case on the sonotrode segment and on the anvil segment and the cutting and tensioning device is arranged between the first and the second sealing region. The result here is that through the rotational arrangement of sonotrode and anvil, first of all a sealing step (foot seam of the leading packaging), then the tensioning and cutting step and then again a sealing step (head seam of the following packaging) are carried out.
  • The apparatus according to the invention, in this case, can be arranged horizontally or vertically, i.e. a conveying direction for the packaging material can be horizontal or vertical. In addition, the apparatus can operate continuously or intermittently.
  • In addition, the invention relates to a bag forming, filling and sealing machine, which comprises an apparatus according to the invention for welding and separating packaging materials. In a particularly preferred manner, in this case, the sonotrode and the anvil are arranged vertically and the conveying direction of the created tubular bags is also vertical. This means that it is also possible for the packaging material to be entrained through contact between the sonotrode and the anvil during the sealing steps.
  • It must be noted that, in principle, the number of sonotrode segments and the number of anvil segments is freely selectable and, where applicable, is dependent on the product size or on a diameter of the rotating sonotrode or of the rotating anvil. However, an even number of sonotrode segments and anvil segments is preferred and 2 to 8 segments are particularly preferred, preferably in each case 6 segments.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Exemplary embodiments of the invention are described below with reference to the accompanying drawing, in which, in detail:
  • FIG. 1 shows a schematic view of an apparatus according to a first exemplary embodiment of the invention, in a first position,
  • FIG. 2 shows a schematic view of the apparatus in FIG. 1, in a second position,
  • FIG. 3 shows a schematic view of the apparatus in FIG. 1, in a third position,
  • FIG. 4 shows a schematic view of the apparatus in FIG. 1, in a fourth position,
  • FIG. 5 shows a schematic view of the apparatus in FIG. 1, in a fifth position,
  • FIG. 6 shows a schematic side view of a cutting and tensioning device according to the first exemplary embodiment,
  • FIG. 7 shows a schematic view of the apparatus according to a second exemplary embodiment,
  • FIG. 8 shows a schematic view of the apparatus according to a third exemplary embodiment of the invention.
    •  DETAILED DESCRIPTION
  • An apparatus 1 for welding and separating packaging materials according to a preferred exemplary embodiment of the invention is described below in detail with reference to FIGS. 1 to 6.
  • As can be seen from FIGS. 1 to 6, the apparatus 1 for welding and separating packaging materials includes an ultrasonic welding apparatus 2 having a sonotrode 3 and an anvil 4. The sonotrode 3 and the anvil 4 are in each case constructed in a star-shaped manner, the sonotrode 3 including a plurality of sonotrode segments 3 a that protrude radially outwardly from a central region. The anvil 4 is also constructed in a star-shaped manner and includes a plurality of anvil segments 4 a that also protrude outwardly in a star-shaped manner from a central region of the anvil. The number of sonotrode segments 3 a and of anvil segments 4 a, in this case, is identical and is, for example, 6. The sonotrode 3 is rotatable about an axis of rotation (not shown) in the direction of arrow B and the anvil 4 is rotatable about an axis of rotation (not shown either) in the direction of arrow C.
  • In this exemplary embodiment, the sonotrode and the anvil 4 are arranged vertically and the packaging material 8 is guided through between the sonotrode 3 and the anvil 4 in the direction of arrow A.
  • In this exemplary embodiment, the apparatus 1 is part of a bag forming, filling and sealing machine which operates in a continuous or intermittent manner and, in this case, forms and fills bags. The reference 9, in this case, is given to a bag that has already been filled with an article, such as, for example, sweets, and the reference 10 denotes a bag that has already been formed, but has not yet been filled.
  • The sonotrode 3 has a first sealing region 13 and a second sealing region 23 on each sonotrode segment 3 a. In an identical manner, each anvil segment 4 a of the anvil 4 has a first sealing region 14 and a second sealing region 24. As is clear from FIGS. 1 to 5, in this case the first sealing regions 13, 14 and the second sealing regions 23, 24 interact in each case in order to carry out a sealing operation in dependence on a position of rotation between the sonotrode 3 and the anvil 4. As can be seen from FIG. 3 or FIG. 5, the second sealing regions 23, 24 serve for sealing a foot seam of a leading bag 9 that has already been filled and the first sealing regions 13, 14 serve for sealing a head seam of a trailing bag 10 (FIG. 5).
  • In addition, the apparatus 1 includes a combined cutting and tensioning device 5. The combined cutting and tensioning device 5 is used, on the one hand, for tensioning the packaging material 8 and, on the other hand, for cutting the packaging material in order to separate the leading bag 9 from the trailing bag 10. As can be seen from the figures, the cutting and tensioning device 5 is arranged on the anvil 4, more precisely on each anvil segment 4 a. The cutting and tensioning device 5, in this case, is arranged on the anvil between the first sealing region 14 and the second sealing region 24 of the anvil segment. In this case, the cutting and tensioning device 5 protrudes at a height H radially above the anvil segment 4 a. The cutting and tensioning device 5 includes a height adjusting device 7 in order to adjust a relative position of the cutting and tensioning device 5 in relation to the anvil segment 4 a. To this end, the height adjusting device 7 includes a first slanting plane 7 a and a second slanting plane 7 b. By changing the position on the slanting planes, the height of the cutting and tensioning device 5 can be changed. As can be seen in FIG. 6, the height adjusting device 7 includes a first screw 71 and a second screw 72. Said two screws 71, 72, as indicated by the two double arrows R and S, can be adjusted in both directions in the longitudinal direction of the cutting edge 6. This means that it is possible for the entire cutting and tensioning device 5 to be adjusted to the side, a height adjustment of the cutting and tensioning device 5 upwards or downwards being possible on account of the slanting planes 7 a, 7 b. As the slanting planes 7 a, 7 b have only a very small gradient, it is possible to carry out a very precise height adjustment.
  • In addition, a recess 11 is provided in the sonotrode segment 3 a. The recess 11 is arranged at a similar position on the sonotrode segment 3 a as the cutting and tensioning device 5 on the anvil, i.e. between the first sealing region 13 and the second sealing region 23. The recess 11, in this case, is developed in such a manner that contact between the cutting and tensioning device 5 and the sonotrode 3 during the operation is avoided. In this exemplary embodiment, the recess 11 is rectangular. However, it can be circular, as shown in FIG. 6, or trapezoidal, as shown in FIG. 7. In this case, the recess 11 forms with, in each case, an outer circumferential region of the sonotrode segment 3 a an edge 12 that supports a tensioning operation of the packaging material 8.
  • As can be seen in particular from FIG. 4, the cutting and tensioning device 5 extends partially into the recess 11 during the sealing operation without there being at the same time, however, any contact between the cutting and tensioning device 5 and the sonotrode segment 3 a. This means that a cutting edge 6 that is arranged at the radial end of the cutting and tensioning device 5 is protected from contact with the sonotrode segment 3 a which means that no wear occurs on the cutting edge 6 due to contact.
  • The functioning of the apparatus 1 according to the invention, in this case, is as follows. As can be seen in FIG. 1, in a first step, the cutting edge 6 comes into contact with the packaging material 8 between the leading bag 9 and the trailing bag 10. However, in this case, this is not yet a cutting operation as the packaging material 8 is not yet correctly tensioned. When the sonotrode 3 and the anvil 4 rotate further in the direction of arrows B and C, the cutting edge 6 of the cutting and tensioning device 5 migrates somewhat into the recess 11. In this case, as can be seen in FIG. 2, the packaging material is tensioned at a region 8 a substantially between the cutting edge 6 and the edge 12 on the sonotrode segment 3 a. This causes the cutting edge 6 to begin to penetrate into the packaging material 8 and carry out the cutting operation (FIG. 3). Consequently, the cutting edge 6 has, at the same time, a tensioning and cutting function. At the same time, with the position shown in FIG. 3, the sealing operation of the foot seam of the leading bag 9 by the second sealing regions 23, 24 begins between sonotrode and anvil. In the position shown in FIG. 4, the cutting operation is completed such that the leading bag 9, which has already been filled, is separated from the trailing bag 10. Likewise in FIG. 4, the sealing operation at the foot end of the leading bag 9 is completed such that a sealing seam 9 a has been produced there. At the same time, in FIG. 4, the sealing operation for the head end of the trailing bag 10 begins by means of the first sealing regions 13, 14. In FIG. 5, the leading bag 9 has been conveyed further by a conveying device (not shown) and the sealing operation of the head seam at the trailing bag 10 has just been completed. Through the contact between the first sealing regions 13, 14 of the packaging material and the sonotrode and the anvil, a conveying function for the trailing bag 10 is also carried out. Said bag is subsequently filled and conveyed further until the following sonotrode or anvil segments then carry out the foot seam and the tensioning and cutting operation by means of the tensioning and cutting device 5.
  • Consequently, according to the invention, both the sealing of a head seam and a foot seam and separating of two consecutive bags can be carried out in one operating cycle. The cutting operation, in this case, requires no additional auxiliary power with, for example, pneumatic or hydraulic support and runs completely free of wear.
  • In addition, it must be noted that by varying the geometry of the cutting edge 6, it is also possible to create different cut contours and, for example, by providing a short additional cutting edge, directed in the direction of rotation, a pull-tab can be inserted into the foot seam of the packaging. In addition, according to the invention, there is no need for vibration decoupling between the components of the ultrasonic welding apparatus and the cutting device as the cutting and tensioning device 5 according to the invention is arranged purely on the anvil 4 and has no contact with the sonotrode 3.

Claims (20)

1. An apparatus for welding and separating a packaging material (8), said apparatus comprising
an ultrasonic welding apparatus (2) having a sonotrode (3) with at least one sonotrode segment (3 a), and an anvil (4) with at least one anvil segment (4 a), and
a combined cutting and tensioning device (5),
wherein the sonotrode (3) is rotatable about a first axis of rotation and wherein the anvil (4) is rotatable about a second axis of rotation,
wherein the cutting and tensioning device (5) is incorporated in the ultrasonic welding apparatus (2), and
wherein the cutting and tensioning device (5) initially tensions the supplied packaging material (8) and then cuts it in the tensioned state by means of a cutting edge (6).
2. The apparatus as claimed in claim 1, characterized in that the cutting edge (6) also tensions the packaging material (9).
3. The apparatus as claimed in claim 1, characterized in that the cutting and tensioning device (5) is located on the anvil (4).
4. The apparatus as claimed in claim 1, characterized in that the sonotrode (3) has a plurality of radially projecting sonotrode segments (3 a) and the anvil (4) has a plurality of radially projecting anvil segments (4 a).
5. The apparatus as claimed in claim 1, characterized in that the cutting and tensioning device (5) includes an adjusting device (7) in order to adjust the cutting and tensioning device (5) in the radial direction.
6. The apparatus as claimed in claim 1, characterized in that a recess (11) is formed on the sonotrode segment (3 a) in order to accommodate the cutting and tensioning device (5) at least partially during the cutting operation.
7. The apparatus as claimed in claim 6, characterized in that the recess (11) is rectangular or triangular or trapezoidal or circular.
8. The apparatus as claimed in claim 5, characterized in that the adjusting device (7) includes a first slanting plane (7 a) and a second slanting plane (7 b) in order to change a position of the cutting and tensioning device (5) in the radial direction.
9. The apparatus as claimed in claim 1, characterized in that the cutting and tensioning device (5) is arranged so as to be exchangeable.
10. The apparatus as claimed in claim 1, characterized in that the cutting and tensioning device (5) has a straight cutting edge or an undulating cutting edge or a zigzag cutting edge.
11. The apparatus as claimed in claim 1, characterized in that a first sealing region (13, 23) and a second sealing region (14, 24) is realized in each case on the sonotrode segment (3 a) and on the anvil segment (4 a) and the cutting and tensioning device (5) is arranged on the anvil (4) between the first sealing region (14) and the second sealing region (24).
12. A bag forming, filling and sealing machine, comprising an apparatus for welding and separating as claimed in claim 1.
13. The apparatus as claimed in claim 2, characterized in that the cutting and tensioning device (5) is located on the anvil (4).
14. The apparatus as claimed in claim 13, characterized in that the sonotrode (3) has a plurality of radially projecting sonotrode segments (3 a) and the anvil (4) has a plurality of radially projecting anvil segments (4 a).
15. The apparatus as claimed in claim 14, characterized in that the cutting and tensioning device (5) includes an adjusting device (7) in order to adjust the cutting and tensioning device (5) in the radial direction.
16. The apparatus as claimed in claim 15, characterized in that a recess (11) is formed on the sonotrode segment (3 a) in order to accommodate the cutting and tensioning device (5) at least partially during the cutting operation.
17. The apparatus as claimed in claim 16, characterized in that the recess (11) is rectangular or triangular or trapezoidal or circular.
18. The apparatus as claimed in claim 17, characterized in that the adjusting device (7) includes a first slanting plane (7 a) and a second slanting plane (7 b) in order to change a position of the cutting and tensioning device (5) in the radial direction.
19. The apparatus as claimed in claim 18, characterized in that the cutting and tensioning device (5) is arranged so as to be exchangeable.
20. The apparatus as claimed in claim 19, characterized in that the cutting and tensioning device (5) has a straight cutting edge or an undulating cutting edge or a zigzag cutting edge.
US13/262,810 2009-04-01 2010-02-26 Apparatus for welding and separating packaging materials Abandoned US20120090283A1 (en)

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